Generic Sensor Platform for Networked Sensors

1
Generic Sensor Platform for Networked Sensors

• Haywood Ho

2
Introduction

• Smart Dust
• TinyOS
• Generic Sensor

3
Smart Dust

• MICA
• ATMEL ATMEGA103 4MHz processor
• 512 KB flash memory, 4 KB RAM
• A/D converter
• Network reprogramming
• Battery
• Radio (916 MHz)

4
(No Transcript)
5
Overview of TinyOS

• Tiny, Microthreaded, Operating System
• Designed specifically to meet constraints of
  sensor networks
• Robust operation
• Low computational power
• Low power
• Little memory

6
Tiny OS The Software

• Component based model
• Abstracts hardware specifics from application
  programmer
• Capable of maintaining high levels of concurrency
• Services Provided Include
• RF messaging protocols.
• Periodic Timer Events.
• Asynchronous access to UART data transfers.
• Mechanism for Static, Persistent Storage.
• Complete applications fit in 4KB of ROM and 256B
  RAM

7
Generic Sensor Platform

• Currently, three types of messages
• A network discovery packet
• Data packets
• Generic Sensor command packets

8
Generic Sensor Overview

• Matlab front-end to allow application developers
  to control motes
• Integrates many pre-existing applications to
  allow motes to be programmed with Matlab instead
  of TinyOS code (abstraction)
• No need for network reprogramming
• Library of data analysis tools in Matlab

9
Architecture
10
Network Discovery Radio Cells
11
Network Discovery
12
Network Discovery

• Simple routing algorithm to form routing tree
• No cycles
• Over rebroadcasts

13
OSCOPE Data Packets

• Routed back to the base station using stored
  route from network discovery
• Data can then be captured and visualized in
  real-time in the Matlab environment

14
Demonstration
15
Conclusions

• Generic Sensor platform allows faster deployment
  of sensor networks
• Allows application programmers to abstract away
  from lower-level details of TinyOS

16
Further Work

• Log and Sleep
• Simultaneous sensing from different data channels
• Time synchronization issues between motes
• Robustness
• Alternative ad-hoc routing alogirthms